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AOSmith Tankless Water Heater

AOSmith Tankless Water Heater

When it comes to high efficiency water heaters, no one comes close to matching the expertise and innovation of A. O. Smith. Whether you need a tankless, a solar or a hybrid water heater, the inventive minds at A. O. Smith have one waiting for you.

With higher efficiency ratings and groundbreaking designs, our new tankless products are part of a new era in water heating.


  • Ultra-Low NOx condensing technology provides 0.95 energy factor
  • Continuous maximum hot water flow rates up to 10.0 GPM
  • All residential models are ENERGY STAR® qualified
  • Primary heat exchanger is constructed of HRS35 Commercial-Grade copper
  • Secondary heat exchanger is made of Type 316L stainless steel
  • Indoor models include a built-in temperature controller and advanced diagnostics to simplify troubleshooting
  • Improved scale reduction software
  • Outdoor models include a wall mount temperature remote controller and advanced diagnostics to simplify troubleshooting

Product Number: 240, 320, 340, 520, 540

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